<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    // promise 接收一个参数，参数是一个函数，函数有两个参数，一个是resolve,一个是reject

    // new Promise((resolve,reject)=>{
    //   // 异步代码
    //   resolve()
    // })


    function request () {
      var xhr = new XMLHttpRequest()
        xhr.open('post', 'http://localhost:3000/list')
        xhr.send()
        xhr.onreadystatechange = function(){
          if (xhr.readyState == 4) {
            let data = JSON.parse(xhr.responseText).data
            // 直接渲染
            render(data)
            
          }
        }
    }

    function render (data) {
      data.forEach(item => {
        document.body.innerHTML += `<p>${item.name}</p>`
      });
    }
    

    request()

  </script>
</body>
</html>